Drain the engine coolant.

Remove the drive belt auto-tensioner.

Remove the water pump (A) by removing the five bolts.

Inspect, and clean the O-ring groove and the mating surface of the engine block.

Install the water pump with a new O-ring (B) in the reverse order of removal.

Clean up any spilled engine coolant.

Install the drive belt auto-tensioner.

Refill the radiator with engine coolant, then bleed air from the cooling system.